[PATCH] Fix PR71057

[Richard Biener]

The following fixes PR71057

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Richard.

2016-05-11  Richard Biener  <rguent...@suse.de>

        PR debug/71057
        * dwarf2out.c (retry_incomplete_types): Set early_dwarf.
        (dwarf2out_finish): Move retry_incomplete_types call ...
        (dwarf2out_early_finish): ... here.

        * g++.dg/debug/pr71057.C: New testcase.

Index: gcc/dwarf2out.c
===================================================================
*** gcc/dwarf2out.c     (revision 236032)
--- gcc/dwarf2out.c     (working copy)
*************** gen_entry_point_die (tree decl, dw_die_r
*** 19401,19411 ****
--- 19401,19413 ----
  static void
  retry_incomplete_types (void)
  {
+   set_early_dwarf s;
    int i;
  
    for (i = vec_safe_length (incomplete_types) - 1; i >= 0; i--)
      if (should_emit_struct_debug ((*incomplete_types)[i], 
DINFO_USAGE_DIR_USE))
        gen_type_die ((*incomplete_types)[i], comp_unit_die ());
+   vec_safe_truncate (incomplete_types, 0);
  }
  
  /* Determine what tag to use for a record type.  */
*************** dwarf2out_finish (const char *filename)
*** 27382,27391 ****
    resolve_addr (comp_unit_die ());
    move_marked_base_types ();
  
-   /* Walk through the list of incomplete types again, trying once more to
-      emit full debugging info for them.  */
-   retry_incomplete_types ();
- 
    if (flag_eliminate_unused_debug_types)
      prune_unused_types ();
  
--- 27384,27389 ----
*************** dwarf2out_finish (const char *filename)
*** 27686,27691 ****
--- 27684,27693 ----
  static void
  dwarf2out_early_finish (void)
  {
+   /* Walk through the list of incomplete types again, trying once more to
+      emit full debugging info for them.  */
+   retry_incomplete_types ();
+ 
    /* The point here is to flush out the limbo list so that it is empty
       and we don't need to stream it for LTO.  */
    flush_limbo_die_list ();
Index: gcc/testsuite/g++.dg/debug/pr71057.C
===================================================================
*** gcc/testsuite/g++.dg/debug/pr71057.C        (revision 0)
--- gcc/testsuite/g++.dg/debug/pr71057.C        (working copy)
***************
*** 0 ****
--- 1,12 ----
+ // { dg-do compile }
+ // { dg-options "-g" }
+ template <typename _Tp> using decay_t = _Tp;
+ template <typename> struct A;
+ template <typename> struct B { B(A<int>); };
+ template <typename> struct C {
+       template <typename U> using constructor = B<decay_t<U>>;
+         typedef constructor<int> dummy;
+ };
+ template <typename> struct D {};
+ C<int> a;
+ D<B<int>> fn1() { fn1, a; }